Is Dr. Sievers' homicide tied to other doctors' deaths?

It has been a week since Dr.Teresa Sievers was found murdered in her Bonita Springs home. As authorities continue to investigate, we have learned Sievers isn't the only Florida doctor with ties to holistic medicine found dead in recent weeks.

Monday, July 6th 2015, 7:45 PM EDT

Updated:

Monday, July 6th 2015, 7:49 PM EDT

It has been a week since Dr. Teresa Sievers was found murdered in her Bonita Springs home and as she was laid to rest Monday there have been no arrests.

Detectives were back at the home Monday investigating and according to neighbors, investigators told them the murder weapon was a hammer.

Some conspiracy theorists online argue that each of the three doctors and their deaths involve stories that are not done being told despite what official accounts may say.

Doctors Jeff Bradstreet and Bruce Hedendal both died within weeks of each other back in June.

Bradstreet was found dead with a gunshot wound to the chest in North Carolina on June 26. Investigators have said he killed himself.

Reports show Hedendal was found dead in his car. Some say he died of natural causes.

An account set up by Bradstreet's family looks to raise money - with claims of finding out the truth.

His niece describes him as "never giving up".

All three doctors took a more natural approach to healing - like Dr. Sievers out of Estero.

But a representative from the National School of Topical Medicine says he isn't buying any conspiracies.

Peter Jay Hotez of the National School of Topical Medicine said: "Look at some anti-vaxxer sites and there is a heavy component of conspiracy theorists that say pharmaceutical companies are in colusion with the Public Health Authorities."

There are also reports that Doctors Bradstreet and Hedendal had been contacted by federal authorities in the days leading up to their deaths.

We reached out to the FDA Monday. They pushed us to the Georgia State Attorney's Office, which declined to comment on any possible investigation.

We'll bring you updates to this story as we get them on air and online.